Brake-bob jaw



S. H. CAMPBELL.

- BRAKE ROD JAW. APPLICATION FILED 1Au.2o.191 9.

1 3 1 2, 680 Patented Aug. 12, 1919.

Fig.,3. 13

18 WITNESS INVENTOR- S. H. Campbell r THE COLUMBIA PLANOGRAPH co.,wAsmmiroN, n. C.

STERLING H. CAMPBELL, OF ST. LOUIS, MISSOURI.

BRAKE-ROD JAW.

Specification of Letters Patent.

7 Application filed January 20. 1919. 7 Serial No. 272,024.

To all whom it may concern:

Be it known that I, STERLING H. CAMP- BELL, a citizen of the UnitedStates of America, residing at the city of St. Louis, State of Missouri,United States of America, have invented certain new and useful Brake-RodJaws, of which the following is such a full, clear, and exactdescription as will enable any one skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, forming part of this specification.

My invention relates to a brake rod jaw and more particularly to a onepiece cast aw.

The object of my invention is to so construct the jaw as to secure asubstantially uniform distribution of metal throughout the jaw and toprovide means for inspecting the walls of the rod seat and further to soconstruct the jaw as to avoid the formation of pockets which mightretain the molding sand or trap the hot gases escaping from the metalwhen the jaw is cast.

In the accompanying drawings which illustrate one form of brake rod jawmade in accordance with my invention, Figure 1 is a side view, Fig. 2 isan edge View, Fig. 3 is a longitudinal central section, and Fig. 4 is asection taken on the line 4-4 of Fig. 3.

It has been found that a one piece cast brake rod jaw of the generaltype shown in patent to Haskel, No. 608,392 of August 2, 1898, is one ofthe simplest and most satisfactory forms of jaw. Heretofore, however,some difficulty has been encountered in casting this form of jaw. First,because of the unequal distribution of metal in the jaw, owing to thecomparatively great bulk of the jaw seat and also owing to the formationof pockets which, are likely to retain the sand or to trap the hot gasesescaping from the cooling jaw. The unequal distribution of metal in thejaw is likely to produce internal cracks and fissures in the rod seatand as these cracks or fissures do not as a rule extend to the surfaceof the metal their presence cannot be discovered until the jaw breaks.One object of my invention is to so form the jaw as to securesubstantially u iform distribution of th m tal at the same time givingaccess to the walls of the rod seat for inspection of'the same andfurthermore to prevent formation of sand or gas pockets.

7 10 represents a pair of parallel arms or jaw members each of which isprovided at its outer end with an opening 11 for the passage of thecoupling pin for securing the jaw to the brake lever. Each of theseopenings 11 is surrounded by an outwardly extending boss 12 the innerends of the arms 10 terminating in loops 1.3 one of which is adapted tosurround the body 14 of the brake rod and the other the return portion15, said parts being separated by the bend 16 which is adapted to bearagainst the rod seat 17 which is formed in part of the inner walls ofloops 13. These walls, however, are separated by a transverse passage 18which is flared at both sides as best shown in Fig. 4 so as to securesubstantially uniform distribution of the metal throughout the inner endof the jaw and at the same time allow inspection of the walls. In orderto prevent the accidental disengagement of the rod 14:, its returnportion 15 has its end 19 upset to fill a countersink 20 formed at theouter end of the loop 13, as best shown in Fig. 3.

To strengthen the arms 10 each of said arms is provided with a pair ofribs 21 which ribs extend from the loops 13 to a point at each sideofthe boss 12 but do not contact with said boss so that the formation ofpockets liable to retain the sand of the mold are obviated. Between theribs 21 each of the arms 10 is preferably provided with an opening 22for the passage of the heated gases from the cooling metal of the aw.

I am aware that two part cast brake rod jaws have heretofore been formedin which the rod seat was provided with a transverse cylindrical passagefor the bolt or rivet holding the two parts of the jaw together, and Ihereby disclaim such construction.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. A one piece cast brake rod jaw comprising a pair of arms terminatingat their inner ends in rod loops, theinner Walls of Patented Aug". 12,1919.

' ing flared at both sides.

3. A one piece castbrake rod jaw comprising a pair of arms each providedat its outer end with an-opening-for coupling pins, each of saidopenings beingprovided with an outwardlyextending boss, and-a pair of myhand and aflixed my seal.

outwardly extending strengthening flanges foreaeh of said arms extendingat each side of said boss, but unconnected therewith.

4:. A one piece cast metal brake rod jaw having substantially uniformwalls, said wallshaving a transverse opening therein forming a hollowrod seat, and retalning means ad acent to said seat for cooperating'witha "portion of a rod to hold the latter against longitudinalmovement in either direction.

In testimony'w hereofl have hereunto-set STERLING H. CAMPBELL. if 5.

Copies of: this patent may be obtained-for five cents each, byaddressing the Commissioner of Patents, Washington, D. 0'.

